<!DOCTYPE html>
<html lang="en-US">
  <head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width" />
    <title>Channel messaging demo</title>
    <style>
      iframe {
        border-radius: 1em;
      }
    </style>
  </head>
  <body>
    <h1>Channel messaging demo</h1>
    <p class="output">Index.html para (I will be overwritten)</p>
    <iframe src="./iframe.html" width="480" height="320"></iframe>
    <script src="./message-channel.js" type="module"></script>
  </body>
</html>